Windows SmartScreen or antivirus might flag the old executable. Fix: Right-click qsp.exe → Properties → Check "Unblock" at the bottom (under Security). Then add the folder to your antivirus exclusions.
For most users, choose the version. It leaves no trace on your system and avoids permission issues on Windows 10/11.
QSP 1.9 is the final, most polished release of the original "classic" branch. Here is why thousands of users still prefer it:
